recode: attempt to fix Darwin testsuite build problem
Merge branch 'recode.130306' of git://github.com/jcumming/nixpkgs

Attempts to fix recode build on darwin, verified by inspection (don't
have a readily available darwin machine for testing right now, will let
hydra see if this worked).

Signed-off-by: Shea Levy <shea@shealevy.com>